Braces, Supports

Dental braces (also known as orthodontic braces or brackets) are a fixed appliance used in orthodontics to correct alignment of teeth and their position with regard to bite. more...

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Braces are often used to correct malocclusions such as underbites, overbites, cross bites and open bites, or crooked teeth, or perfect teeth and various other flaws of teeth and jaws, whether cosmetic or structural. They can be used on either upper or lower teeth, or both. Orthodontic braces are often used in conjunction with other orthodontic appliances to widen the palate or jaws, create spaces between teeth, or otherwise shape the teeth and jaws. Most orthodontic patients are children or teenagers, however, more adults are seeking orthodontic treatment.

History

In the mid-17th century the french physician Pierre Fauchard (the father of modern dentistry) witnessed and treated several dental deformities very common among citizens in Paris during the pre revolutionary France. Historians believe that two different men deserve the title of being called "the Father of Orthodontics." One man was Norman W. Kingsley, a dentist, writer, artist, and sculptor, who wrote his "Treatise on Oral Deformities" in 1880. Kingsley's writings influenced dental science greatly. Also deserving credit is dentist J. N. Farrar, who wrote two volumes entitled "A treatise on the Irregularities of the teeth and their corrections". Farrar was very good at designing brace appliances, and he was the first to suggest the use of mild force at timed intervals to move teeth.

How braces work

Teeth move through the use of force. The force applied by the archwire pushes the tooth in a particular direction and a stress is created within the periodontal ligament. The modification of the periodontal blood supply determines a biological response which leads to bone remodelling, where bone is created on one side by osteoblast cells and resorbed on the other side by osteoclasts.

Two different kinds of bone resorption are possible. Direct resorption, starting from the lining cells of the alveolar bone, and indirect or retrograde resorption, where osteoclasts start their activity in the neighbour bone marrow. Indirect resorption takes place when the periodontal ligament has become acellular (necrosis or hyalinization), for an excessive amount and duration of compressive stress. In this case the quantity of bone resorbed is larger than the quantity of newly formed bone (negative balance). Bone resorption only occurs in the compressed periodontal ligament. Another important phenomenon associated with tooth movement is bone deposition. Bone deposition occurs in the distracted periodontal ligament. Without bone deposition, the tooth will loosen and voids will occur distal to the direction of tooth movement.

Read more at Wikipedia.org